100*64/80 = 80%
80%
The decrease from 80 to 64: 20%
$64
64/80 = 8/10 = 80/100 = 80% 64 is 80% of 80.
80 is 25% more than 64.
20% of 80 is 16 and 80-16= 64
25% 80-64 = 16 16/64 = 1/4
80 x .8 = 64
50 percent of 80 equals 40.
80 percent of 60 percent = 48%
64 is 80% of 80